Flora of North America species comparison

(5)10-30 cm tall, 1.2-1.5 mm thick, bases decumbent, terete or weakly compressed, hispidulous beneath the panicles;

nodes terete, 0(1) exserted.

(5)10-125 cm, terete or weakly compressed;

nodes terete or slightly compressed.

closed for about 1/2 their length, terete, smooth or sparsely to moderately retrorsely scabrous near the collars, glabrous, bases of basal sheaths glabrous, distal sheath lengths 0.9-3.5 times blade lengths;

collars sparsely to moderately retrorsely scabrous, glabrous;

ligules 1-2 mm, scabrous, truncate to obtuse, ciliolate;

innovation blades to 30 cm long, adaxial surfaces moderately to densely scabrous or hispidulous on and between the veins;

cauline blades subequal in length, 1-2 mm wide, involute, moderately thick, moderately firm, arcuate, abaxial surfaces smooth or sparsely scabrous, adaxial surfaces moderately to densely scabrous or hispidulous on and between the veins, apices narrowly prow-shaped, flag leaf blades 1-9 cm.

closed from 1/7 their length to their entire length, terete to compressed, smooth or scabrous, glabrous or pubescent;

ligules 0.2-18 mm, milky white or colorless, usually translucent, truncate to acuminate, glabrous or ciliolate;

innovation blades with the adaxial surfaces usually moderately to densely scabrous or hispidulous on and between the veins, sometimes smooth and glabrous;

cauline blades flat, folded, or involute, thin or thick, lax or straight, smooth or scabrous, adaxial surfaces sometimes hairy, apices narrowly to broadly prow-shaped.

mainly intravaginal, some extravaginal.

intra- and/or extravaginal.

1.5-6 cm, erect, compact, ovoid, contracted, infrequently interrupted, congested, with 15-50 spikelets;

nodes with 1-2 branches, internodes densely hispidulous;

branches 0.5-2 cm, erect, stiff, terete to weakly angled, densely hispidulous, with 1-5 spikelets.

1-29 cm, contracted to open, usually with fewer than 100 spikelets;

nodes with 1-5 branches;

branches 0.5-18 cm, terete or angled, smooth or scabrous, glabrous or hispidulous.

7-12 mm, lengths to 3 times widths, laterally compressed, not sexually dimorphic;

florets 3-6;

rachilla internodes usually shorter than 0.5 mm, smooth, glabrous.

3-17 mm, lengths 3.5 times widths, laterally compressed, not sexually dimorphic, not bulbiferous;

florets 2-10(13) mm, normal;

rachilla internodes smooth or scabrous, glabrous or hairy.

broadly lanceolate, 1/2 as long as to subequal to the adjacent lemmas, distinctly keeled;

lower glumes 3-veined;

upper glumes 4-4.5(7+) mm, 3-veined;

calluses usually with a crown of hairs, sometimes glabrous or diffusely webbed;

lemmas 5-7.5 mm, lanceolate, 5-veined, distinctly keeled, keels, marginal veins, and sometimes the lateral veins short- to long-villous or softly puberulent, rarely glabrous, lateral veins moderately prominent, intercostal regions smooth, glabrous, margins glabrous, apices acute;

palea keels scabrous to pectinate-ciliate, intercostal regions glabrous;

anthers vestigial (0.1-0.2 mm) or (2)2.5-3.5 (4) mm.

distinctly keeled, keels smooth or scabrous;

lower glumes 1, 3(or 5)-veined;

upper glumes 3- or 5-veined;

calluses terete or slightly laterally compressed, glabrous, webbed, or with a crown of hairs;

lemmas 2.6-11 mm, lanceolate, distinctly keeled, keels, veins, and intercostal regions glabrous or hairy, 5-7(11)-veined;

palea keels scabrous, glabrous or with hairs at midlength;

anthers 3, vestigial (0.1-0.2 mm) or 1.3-4.5(5) mm.

= 28.